Global Patent Index - EP 1921621 A1

EP 1921621 A1 20080514 - Reproduced signal equalizing method for optical information media

Title (en)

Reproduced signal equalizing method for optical information media

Title (de)

Verfahren zur Entzerrung reproduzierter Signale von optischen Informationsmedien

Title (fr)

Méthode d'égalisation d'un signal reproduit pour des supports d'information optique

Publication

EP 1921621 A1 20080514 (EN)

Application

EP 08151054 A 20040413

Priority

  • EP 04008751 A 20040413
  • JP 2003108138 A 20030411
  • JP 2004109006 A 20040401

Abstract (en)

Reproduced signals are equalized by the least square technique by using a predetermined number of data samples binarized by a Viterbi decoder. Even when data written on an optical disk is unknown, the data can be equalized in a stable manner and can be reproduced at a low error rate without instability factors such as divergence due to interference.

IPC 8 full level

G11B 20/10 (2006.01); G11B 5/09 (2006.01); G11B 7/00 (2006.01); G11B 7/005 (2006.01); G11B 20/18 (2006.01)

CPC (source: EP US)

G11B 20/10009 (2013.01 - EP US); G11B 20/10046 (2013.01 - EP US); G11B 20/10055 (2013.01 - EP US); G11B 20/1012 (2013.01 - EP US); G11B 20/10296 (2013.01 - EP US); G11B 20/10481 (2013.01 - EP US); G11B 2020/1288 (2013.01 - EP US); G11B 2220/2541 (2013.01 - EP US)

Citation (search report)

  • [A] US 6449110 B1 20020910 - DEGROAT RONALD D [US], et al
  • [A] EP 1160785 A2 20011205 - VICTOR COMPANY OF JAPAN [JP]
  • [A] US 2002012185 A1 20020131 - SAWAGUCHI HIDEKI [JP], et al
  • [A] WO 0022620 A1 20000420 - MATSUSHITA ELECTRIC IND CO LTD [JP], et al & US 6836511 B1 20041228 - MARUKAWA SHOJI [JP]
  • [A] US 6198587 B1 20010306 - HAYASHI HIDEKI [JP]
  • [A] US 2002154434 A1 20021024 - SATOH NAOKI [JP], et al
  • [A] OHKABO S ET AL: "Optimization of write strategy in a PRML system for high density recording", OPTICAL MEMORY AND OPTICAL DATA STORAGE TOPICAL MEETING, 2002. INTERNATIONAL SYMPOSIUM ON 7-11 JULY 2002, PISCATAWAY, NJ, USA,IEEE, 7 July 2002 (2002-07-07), pages 425 - 427, XP010600246, ISBN: 0-7803-7379-0
  • [A] NAGAI Y ET AL: "A new method to evaluate signal quality for systems to which PRML is applied", OPTICAL MEMORY AND OPTICAL DATA STORAGE TOPICAL MEETING, 2002. INTERNATIONAL SYMPOSIUM ON 7-11 JULY 2002, PISCATAWAY, NJ, USA,IEEE, 7 July 2002 (2002-07-07), pages 365 - 367, XP010600227, ISBN: 0-7803-7379-0

Designated contracting state (EPC)

DE FR GB

DOCDB simple family (publication)

EP 1467367 A2 20041013; EP 1467367 A3 20051102; EP 1467367 B1 20101013; CN 100587825 C 20100203; CN 1551190 A 20041201; DE 602004029527 D1 20101125; DE 602004029625 D1 20101125; EP 1921621 A1 20080514; EP 1921621 B1 20101013; JP 2004327017 A 20041118; JP 4554972 B2 20100929; US 2004257954 A1 20041223; US 7636287 B2 20091222

DOCDB simple family (application)

EP 04008751 A 20040413; CN 200410032803 A 20040412; DE 602004029527 T 20040413; DE 602004029625 T 20040413; EP 08151054 A 20040413; JP 2004109006 A 20040401; US 82237404 A 20040412